• Jun 04, 21

    Exploring Obsured Code: Part -1

    This is an snippet I saved back in college. I’m not sure who the original author is for this. Let’s try to understand how this works

    // A decimal to binary convertor
// All Credits to the original author
(_$=($,_=[]+[])=>$?_$($>>+!![],($&+!![])+_):_)(255);
  • May 09, 21

    Node Module System

    Similar to the article I wrote about Lua module loaders, the same can be done in nodejs. We can override the require to be able to load custom extensions

    Wait a minute is there any practical use case other than a syntax hack?

    Well then how about we build a loader so nodejs can read yaml

    require("./loader")
const config = require("config.yaml")
const port = config.port || 3000;
const http = require('http');

const requestListener = function (req, res) {
  res.writeHead(200);
  res.end('Hello, World!');
}

const server = http.createServer(requestListener);
server.listen(config.port);

    This looks way more practical so let’s begin.

    TLDR; Leaving a link to the source code I made for this example

  • Apr 21, 21

    Lua Module Loader

    What if I told you there is a way to extend the default syntax of Lua? In the below example I use @ as an alias for self, and fn as an alias of function. This and may more can be achived with the module loader in Lua

    -- myfile.lua
local greet = fn(name)
  print('Hello ' .. name)
end

greet('mark1626')

---
-- cube.lua
Cube = {a = 1}

function Cube:new(o)
  o = o or {}
  setmetatable(o, @)
  @.__index = @
  return o
end

function Cube:area()
  return @.a * @.a
end

return Cube
  • Mar 16, 21

    The Drunken Bishop

    Have you ever seen something similar to this??

    +----[RSA 2048]---+
|        . o.+o  .|
|     . + *  +o...|
|      + * .. ... |
|       o + .   . |
|        S o   .  |
|         o     . |
|          .     o|
|               .o|
|               Eo|
+------[MD5]------+

    Usually when we create a new SSH key there is an image printed at the last step and we mostly ignore it, this time I wanted to understand what this image meant.

    The image is a visualization of the fingerprint created with the Drunken Bishop Algorithm

  • Mar 09, 21

    Reverse Engineering Code Art - Part 6 - Noisy Donuts

    Based on this dwitter by Pascal

    
c.width=w=70;for(i=2800;i--;)x.fillRect(X=i%w,Y=(i-X)/w,0<T(T(S(X/7+5*C(t))+S(Y/7-5*t))),1)

    Noisy Donuts